I am trying to implement Java Web Socket on localhost using Tomcat 9. I am following the example in the following link:
https://examples.javacodegeeks.com/enterprise-java/tomcat/apache-tomcat-websocket-tutorial/#comments
I was able to run Tomcat 9 server integrate within Eclipse but when i am running the my Java web socket program at Tomcat server i am getting the following:
HTTP Status 404 – Not Found
Type Status Report
Message /WebSocketServerExample/WEB-INF/classes/server/ws/WsServer.java
Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
Apache Tomcat/9.0.16
here is my code (copy/paste from the example)
Server Code:
package server.ws;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint("/websocketendpoint")
public class WsServer {
@OnOpen
public void onOpen(){
System.out.println("Open Connection ...");
}
@OnClose
public void onClose(){
System.out.println("Close Connection ...");
}
@OnMessage
public String onMessage(String message){
System.out.println("Message from the client: " + message);
String echoMsg = "Echo from the server : " + message;
return echoMsg;
}
@OnError
public void onError(Throwable e){
e.printStackTrace();
}
}
Client Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Tomcat WebSocket</title>
</head>
<body>
<form>
<input id="message" type="text">
<input onclick="wsSendMessage();" value="Echo" type="button">
<input onclick="wsCloseConnection();" value="Disconnect" type="button">
</form>
<br>
<textarea id="echoText" rows="5" cols="30"></textarea>
<script type="text/javascript">
var webSocket = new WebSocket("ws://localhost:8080/WebSocketServerExample/websocketendpoint");
var echoText = document.getElementById("echoText");
echoText.value = "";
var message = document.getElementById("message");
webSocket.onopen = function(message){ wsOpen(message);};
webSocket.onmessage = function(message){ wsGetMessage(message);};
webSocket.onclose = function(message){ wsClose(message);};
webSocket.onerror = function(message){ wsError(message);};
function wsOpen(message){
echoText.value += "Connected ... \n";
}
function wsSendMessage(){
webSocket.send(message.value);
echoText.value += "Message sended to the server : " + message.value + "\n";
message.value = "";
}
function wsCloseConnection(){
webSocket.close();
}
function wsGetMessage(message){
echoText.value += "Message received from to the server : " + message.data + "\n";
}
function wsClose(message){
echoText.value += "Disconnect ... \n";
}
function wserror(message){
echoText.value += "Error ... \n";
}
</script>
</body>
</html>
Client is working but it is not able to connect to server.
What i am missing?
